LSP.cs

LSP.cs

public class Rectangle {
  public Rectangle(decimal width, decimal height) {
    Width = width;
    Height = height;
  }
  public decimal Area() {
    return Width * Height;
  }
  public decimal Width { get; private set; }
  public decimal Height { get; private set; }
}
 
public class Square : Rectangle {
  public Square(decimal side) 
    : base (side, side) { 
  }
}